Patch from NixOS:

  https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/libraries/libvirt/0001-meson-patch-in-an-install-prefix-for-building-on-nix.patch

From ad42041cfedcf25716429d2aad16641e0e2a012f Mon Sep 17 00:00:00 2001
From: Euan Kemp <euank@euank.com>
Date: Thu, 14 Jan 2021 00:32:00 -0800
Subject: [PATCH] meson: patch in an install prefix for building on nix

Used in the nixpkgs version of libvirt so that we can install things in
the nix store, but read them from the root filesystem.
---

diff --git a/meson.build b/meson.build
index 9016c0458a..b26e690194 100644
--- a/meson.build
+++ b/meson.build
@@ -39,6 +39,8 @@ if host_machine.system() == 'windows'
   conf.set('WINVER', '0x0600') # Win Vista / Server 2008
 endif
 
+# patched in for nix
+install_prefix = get_option('install_prefix')
 
 # set various paths
 
@@ -57,6 +59,13 @@ else
   sysconfdir = prefix / get_option('sysconfdir')
 endif
 
+# nix: don't prefix the localstatedir; some things need to write to it, so it
+# can't be in the nix store, and that's what the prefix is.
+# We'll prefix things ourselves where needed
+localstatedir = get_option('localstatedir')
+# Same for sysconfidr
+sysconfdir = get_option('sysconfdir')
+
 # if --prefix is /usr, don't use /usr/var for localstatedir or /usr/etc for
 # sysconfdir as this makes a lot of things break in testing situations
 if prefix == '/usr'
diff --git a/meson_options.txt b/meson_options.txt
index 5b43cdbd6b..e9dff18441 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -1,3 +1,5 @@
+option('install_prefix', type: 'string', value: '', description: 'prefix for nix store installation')
+
 option('no_git', type: 'boolean', value: false, description: 'Disable git submodule update')
 option('packager', type: 'string', value: '', description: 'Extra packager name')
 option('packager_version', type: 'string', value: '', description: 'Extra packager version')
diff --git a/src/ch/meson.build b/src/ch/meson.build
index 66b77907b0..6aa9bbc548 100644
--- a/src/ch/meson.build
+++ b/src/ch/meson.build
@@ -64,8 +64,8 @@ if conf.has('WITH_CH')
   }
 
   virt_install_dirs += [
-    localstatedir / 'lib' / 'libvirt' / 'ch',
-    localstatedir / 'log' / 'libvirt' / 'ch',
-    runstatedir / 'libvirt' / 'ch',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'ch',
+    install_prefix + localstatedir / 'log' / 'libvirt' / 'ch',
+    install_prefix + runstatedir / 'libvirt' / 'ch',
   ]
 endif
diff --git a/src/interface/meson.build b/src/interface/meson.build
index 828f274422..2a6b1f8c5e 100644
--- a/src/interface/meson.build
+++ b/src/interface/meson.build
@@ -56,6 +56,6 @@ if conf.has('WITH_INTERFACE')
   }
 
   virt_install_dirs += [
-    runstatedir / 'libvirt' / 'interface',
+    install_prefix + runstatedir / 'libvirt' / 'interface',
   ]
 endif
diff --git a/src/libxl/meson.build b/src/libxl/meson.build
index 0cc277db82..48d8c5b962 100644
--- a/src/libxl/meson.build
+++ b/src/libxl/meson.build
@@ -79,14 +79,14 @@ if conf.has('WITH_LIBXL')
   }
 
   virt_install_dirs += [
-    confdir / 'libxl',
-    confdir / 'libxl' / 'autostart',
-    localstatedir / 'lib' / 'libvirt' / 'libxl',
-    localstatedir / 'lib' / 'libvirt' / 'libxl' / 'channel',
-    localstatedir / 'lib' / 'libvirt' / 'libxl' / 'channel' / 'target',
-    localstatedir / 'lib' / 'libvirt' / 'libxl' / 'dump',
-    localstatedir / 'lib' / 'libvirt' / 'libxl' / 'save',
-    localstatedir / 'log' / 'libvirt' / 'libxl',
-    runstatedir / 'libvirt' / 'libxl',
+    install_prefix + confdir / 'libxl',
+    install_prefix + confdir / 'libxl' / 'autostart',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'libxl',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'libxl' / 'channel',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'libxl' / 'channel' / 'target',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'libxl' / 'dump',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'libxl' / 'save',
+    install_prefix + localstatedir / 'log' / 'libvirt' / 'libxl',
+    install_prefix + runstatedir / 'libvirt' / 'libxl',
   ]
 endif
diff --git a/src/locking/meson.build b/src/locking/meson.build
index 72f7780438..abe70d20d5 100644
--- a/src/locking/meson.build
+++ b/src/locking/meson.build
@@ -238,14 +238,14 @@ if conf.has('WITH_LIBVIRTD')
   }
 
   virt_install_dirs += [
-    localstatedir / 'lib' / 'libvirt' / 'lockd',
-    localstatedir / 'lib' / 'libvirt' / 'lockd' / 'files',
-    runstatedir / 'libvirt' / 'lockd',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'lockd',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'lockd' / 'files',
+    install_prefix + runstatedir / 'libvirt' / 'lockd',
   ]
 
   if conf.has('WITH_SANLOCK')
     virt_install_dirs += [
-      localstatedir / 'lib' / 'libvirt' / 'sanlock',
+      install_prefix + localstatedir / 'lib' / 'libvirt' / 'sanlock',
     ]
   endif
 endif
diff --git a/src/lxc/meson.build b/src/lxc/meson.build
index 99d4a34213..aae477c1ee 100644
--- a/src/lxc/meson.build
+++ b/src/lxc/meson.build
@@ -176,10 +176,10 @@ if conf.has('WITH_LXC')
   }
 
   virt_install_dirs += [
-    confdir / 'lxc',
-    confdir / 'lxc' / 'autostart',
-    localstatedir / 'lib' / 'libvirt' / 'lxc',
-    localstatedir / 'log' / 'libvirt' / 'lxc',
-    runstatedir / 'libvirt' / 'lxc',
+    install_prefix + confdir / 'lxc',
+    install_prefix + confdir / 'lxc' / 'autostart',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'lxc',
+    install_prefix + localstatedir / 'log' / 'libvirt' / 'lxc',
+    install_prefix + runstatedir / 'libvirt' / 'lxc',
   ]
 endif
diff --git a/src/meson.build b/src/meson.build
index b2d951d36c..305716010f 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -210,7 +210,7 @@ openrc_init_files = []
 
 # virt_install_dirs:
 #   list of directories to create during installation
-virt_install_dirs = [ confdir ]
+virt_install_dirs = [ install_prefix + confdir ]
 
 # driver_source_files:
 #   driver source files to check
@@ -663,7 +663,7 @@ endforeach
 
 virt_conf_files += 'libvirt.conf'
 
-install_data(virt_conf_files, install_dir: confdir)
+install_data(virt_conf_files, install_dir: install_prefix + confdir)
 install_data(virt_aug_files, install_dir: virt_aug_dir)
 
 # augeas_test_data:
@@ -723,7 +723,7 @@ foreach data : virt_daemon_confs
     output: '@0@.conf'.format(data['name']),
     configuration: daemon_conf,
     install: true,
-    install_dir: confdir,
+    install_dir: install_prefix + confdir,
   )
 
   if data.get('with_ip', false)
@@ -847,7 +847,7 @@ if conf.has('WITH_LIBVIRTD')
 
       install_data(
         init_file,
-        install_dir: sysconfdir / 'init.d',
+        install_dir: install_prefix + sysconfdir / 'init.d',
         install_mode: 'rwxr-xr-x',
         rename: [ init['name'] ],
       )
@@ -855,7 +855,7 @@ if conf.has('WITH_LIBVIRTD')
       if init.has_key('confd')
         install_data(
           init['confd'],
-          install_dir: sysconfdir / 'conf.d',
+          install_dir: install_prefix + sysconfdir / 'conf.d',
           rename: [ init['name'] ],
         )
       endif
@@ -882,10 +882,10 @@ endif
 # Install empty directories
 
 virt_install_dirs += [
-  localstatedir / 'cache' / 'libvirt',
-  localstatedir / 'lib' / 'libvirt' / 'images',
-  localstatedir / 'lib' / 'libvirt' / 'filesystems',
-  localstatedir / 'lib' / 'libvirt' / 'boot',
+  install_prefix + localstatedir / 'cache' / 'libvirt',
+  install_prefix + localstatedir / 'lib' / 'libvirt' / 'images',
+  install_prefix + localstatedir / 'lib' / 'libvirt' / 'filesystems',
+  install_prefix + localstatedir / 'lib' / 'libvirt' / 'boot',
 ]
 
 meson.add_install_script(
diff --git a/src/network/meson.build b/src/network/meson.build
index b5eff0c3ab..a0f26d624e 100644
--- a/src/network/meson.build
+++ b/src/network/meson.build
@@ -73,11 +73,11 @@ if conf.has('WITH_NETWORK')
   }
 
   virt_install_dirs += [
-    confdir / 'qemu' / 'networks',
-    confdir / 'qemu' / 'networks' / 'autostart',
-    localstatedir / 'lib' / 'libvirt' / 'network',
-    localstatedir / 'lib' / 'libvirt' / 'dnsmasq',
-    runstatedir / 'libvirt' / 'network',
+    install_prefix + confdir / 'qemu' / 'networks',
+    install_prefix + confdir / 'qemu' / 'networks' / 'autostart',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'network',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'dnsmasq',
+    install_prefix + runstatedir / 'libvirt' / 'network',
   ]
 
   configure_file(
@@ -85,12 +85,12 @@ if conf.has('WITH_NETWORK')
     output: '@BASENAME@',
     copy: true,
     install: true,
-    install_dir: confdir / 'qemu' / 'networks',
+    install_dir: install_prefix + confdir / 'qemu' / 'networks',
   )
 
   meson.add_install_script(
     meson_python_prog.path(), python3_prog.path(), meson_install_symlink_prog.path(),
-    confdir / 'qemu' / 'networks' / 'autostart',
+    install_prefix + confdir / 'qemu' / 'networks' / 'autostart',
     '../default.xml', 'default.xml',
   )
 
diff --git a/src/node_device/meson.build b/src/node_device/meson.build
index 1c95975c37..a7831242db 100644
--- a/src/node_device/meson.build
+++ b/src/node_device/meson.build
@@ -64,6 +64,6 @@ if conf.has('WITH_NODE_DEVICES')
   }
 
   virt_install_dirs += [
-    runstatedir / 'libvirt' / 'nodedev',
+    install_prefix + runstatedir / 'libvirt' / 'nodedev',
   ]
 endif
diff --git a/src/nwfilter/meson.build b/src/nwfilter/meson.build
index 55cf8fcce4..d331086f2e 100644
--- a/src/nwfilter/meson.build
+++ b/src/nwfilter/meson.build
@@ -62,9 +62,9 @@ if conf.has('WITH_NWFILTER')
   }
 
   virt_install_dirs += [
-    confdir / 'nwfilter',
-    runstatedir / 'libvirt' / 'nwfilter-binding',
-    runstatedir / 'libvirt' / 'nwfilter',
+    install_prefix + confdir / 'nwfilter',
+    install_prefix + runstatedir / 'libvirt' / 'nwfilter-binding',
+    install_prefix + runstatedir / 'libvirt' / 'nwfilter',
   ]
 
   subdir('xml')
diff --git a/src/nwfilter/xml/meson.build b/src/nwfilter/xml/meson.build
index 0d96c54ebe..66c92a1016 100644
--- a/src/nwfilter/xml/meson.build
+++ b/src/nwfilter/xml/meson.build
@@ -25,4 +25,4 @@ nwfilter_xml_files = [
   'qemu-announce-self.xml',
 ]
 
-install_data(nwfilter_xml_files, install_dir: sysconfdir / 'libvirt' / 'nwfilter')
+install_data(nwfilter_xml_files, install_dir: install_prefix + sysconfdir / 'libvirt' / 'nwfilter')
diff --git a/src/qemu/meson.build b/src/qemu/meson.build
index 39f0f615cc..5f6f30f82b 100644
--- a/src/qemu/meson.build
+++ b/src/qemu/meson.build
@@ -175,24 +175,24 @@ if conf.has('WITH_QEMU')
   endif
 
   virt_install_dirs += [
-    confdir / 'qemu',
-    confdir / 'qemu' / 'autostart',
-    localstatedir / 'cache' / 'libvirt' / 'qemu',
-    localstatedir / 'lib' / 'libvirt' / 'qemu',
-    localstatedir / 'lib' / 'libvirt' / 'qemu' / 'channel',
-    localstatedir / 'lib' / 'libvirt' / 'qemu' / 'channel' / 'target',
-    localstatedir / 'lib' / 'libvirt' / 'qemu' / 'checkpoint',
-    localstatedir / 'lib' / 'libvirt' / 'qemu' / 'dump',
-    localstatedir / 'lib' / 'libvirt' / 'qemu' / 'nvram',
-    localstatedir / 'lib' / 'libvirt' / 'qemu' / 'ram',
-    localstatedir / 'lib' / 'libvirt' / 'qemu' / 'save',
-    localstatedir / 'lib' / 'libvirt' / 'qemu' / 'snapshot',
-    localstatedir / 'lib' / 'libvirt' / 'swtpm',
-    localstatedir / 'log' / 'libvirt' / 'qemu',
-    localstatedir / 'log' / 'swtpm' / 'libvirt' / 'qemu',
-    runstatedir / 'libvirt' / 'qemu',
-    runstatedir / 'libvirt' / 'qemu' / 'dbus',
-    runstatedir / 'libvirt' / 'qemu' / 'slirp',
-    runstatedir / 'libvirt' / 'qemu' / 'swtpm',
+    install_prefix + confdir / 'qemu',
+    install_prefix + confdir / 'qemu' / 'autostart',
+    install_prefix + localstatedir / 'cache' / 'libvirt' / 'qemu',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'qemu',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'qemu' / 'channel',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'qemu' / 'channel' / 'target',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'qemu' / 'checkpoint',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'qemu' / 'dump',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'qemu' / 'nvram',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'qemu' / 'ram',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'qemu' / 'save',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'qemu' / 'snapshot',
+    install_prefix + localstatedir / 'lib' / 'libvirt' / 'swtpm',
+    install_prefix + localstatedir / 'log' / 'libvirt' / 'qemu',
+    install_prefix + localstatedir / 'log' / 'swtpm' / 'libvirt' / 'qemu',
+    install_prefix + runstatedir / 'libvirt' / 'qemu',
+    install_prefix + runstatedir / 'libvirt' / 'qemu' / 'dbus',
+    install_prefix + runstatedir / 'libvirt' / 'qemu' / 'slirp',
+    install_prefix + runstatedir / 'libvirt' / 'qemu' / 'swtpm',
   ]
 endif
diff --git a/src/remote/meson.build b/src/remote/meson.build
index b2aafe6320..6972d254ca 100644
--- a/src/remote/meson.build
+++ b/src/remote/meson.build
@@ -235,9 +235,9 @@ if conf.has('WITH_REMOTE')
     }
 
     virt_install_dirs += [
-      localstatedir / 'log' / 'libvirt',
-      runstatedir / 'libvirt',
-      runstatedir / 'libvirt' / 'common',
+      install_prefix + localstatedir / 'log' / 'libvirt',
+      install_prefix + runstatedir / 'libvirt',
+      install_prefix + runstatedir / 'libvirt' / 'common',
     ]
 
     logrotate_conf = configuration_data()
@@ -251,7 +251,7 @@ if conf.has('WITH_REMOTE')
       )
       install_data(
         log_file,
-        install_dir: sysconfdir / 'logrotate.d',
+        install_dir: install_prefix + sysconfdir / 'logrotate.d',
         rename: [ name ],
       )
     endforeach
@@ -301,7 +301,7 @@ endif
 if conf.has('WITH_SASL')
   install_data(
     'libvirtd.sasl',
-    install_dir: sysconfdir / 'sasl2',
+    install_dir: install_prefix + sysconfdir / 'sasl2',
     rename: [ 'libvirt.conf' ],
   )
 endif
diff --git a/src/secret/meson.build b/src/secret/meson.build
index 1bda59849b..392bc2cb2e 100644
--- a/src/secret/meson.build
+++ b/src/secret/meson.build
@@ -45,7 +45,7 @@ if conf.has('WITH_SECRETS')
   }
 
   virt_install_dirs += [
-    confdir / 'secrets',
-    runstatedir / 'libvirt' / 'secrets',
+    install_prefix + confdir / 'secrets',
+    install_prefix + runstatedir / 'libvirt' / 'secrets',
   ]
 endif
diff --git a/src/security/apparmor/meson.build b/src/security/apparmor/meson.build
index 990f00b4f3..e5a7a14e1d 100644
--- a/src/security/apparmor/meson.build
+++ b/src/security/apparmor/meson.build
@@ -19,22 +19,22 @@ foreach name : apparmor_gen_profiles
     output: name,
     configuration: apparmor_gen_profiles_conf,
     install: true,
-    install_dir: apparmor_dir,
+    install_dir: install_prefix + apparmor_dir,
   )
 endforeach
 
 install_data(
   [ 'libvirt-qemu', 'libvirt-lxc' ],
-  install_dir: apparmor_dir / 'abstractions',
+  install_dir: install_prefix + apparmor_dir / 'abstractions',
 )
 
 install_data(
   [ 'TEMPLATE.qemu', 'TEMPLATE.lxc' ],
-  install_dir: apparmor_dir / 'libvirt',
+  install_dir: install_prefix + apparmor_dir / 'libvirt',
 )
 
 install_data(
   'usr.lib.libvirt.virt-aa-helper.local',
-  install_dir: apparmor_dir / 'local',
+  install_dir: install_prefix + apparmor_dir / 'local',
   rename: 'usr.lib.libvirt.virt-aa-helper',
 )
diff --git a/src/storage/meson.build b/src/storage/meson.build
index 26e7ff1a1a..ad5c6eddc3 100644
--- a/src/storage/meson.build
+++ b/src/storage/meson.build
@@ -127,9 +127,9 @@ if conf.has('WITH_STORAGE')
   }
 
   virt_install_dirs += [
-    confdir / 'storage',
-    confdir / 'storage' / 'autostart',
-    runstatedir / 'libvirt' / 'storage',
+    install_prefix + confdir / 'storage',
+    install_prefix + confdir / 'storage' / 'autostart',
+    install_prefix + runstatedir / 'libvirt' / 'storage',
   ]
 endif
 
diff --git a/tools/meson.build b/tools/meson.build
index f4b4a16c29..059c73a955 100644
--- a/tools/meson.build
+++ b/tools/meson.build
@@ -120,7 +120,7 @@ if conf.has('WITH_LOGIN_SHELL')
     install_rpath: libvirt_rpath,
   )
 
-  install_data('virt-login-shell.conf', install_dir: sysconfdir / 'libvirt')
+  install_data('virt-login-shell.conf', install_dir: install_prefix + sysconfdir / 'libvirt')
 endif
 
 if host_machine.system() == 'windows'
-- 
2.35.1

